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Buy a framing square with the clamps...

Posted by Jim -ATS on March 31st, 2000 09:14 PM
In reply to Formula for stairs by Donna on March 31st, 2000 08:26 PM [Go to top of thread]

Your life will be a lot easier with this tool. The clamps are two little hexagonal shaped pieces of brass that screw onto the square in specific places, allowing you to repeat a measurement very easily as you mark up your layout.

Most regional codes require that every riser be equal, and every tread be equal. The code recognizes that things vary from building to building when it comes to stair layouts, but you want to get as close to a 7" rise as you can.

8'=96 inches

96/7 = 13.714, or 14 risers
96/14 = 6.86, or six and seven-eighths inches per riser.
so, you will have 13 treads, plus the floor below and the floor above, or a total of 14 steps from floor 1 to floor 2.

Set the framing square with one clamp 6-7/8 from the outside corner, and the other at 11" from the outside corner. Then lay out the stringer from one end to the other. The specifics are a lot easier to understand from pictures, go buy an Ortho or Sunset remodeling book.

Your staircase length will be 14x11, or 154", or 12'-10", plus a minimum of three feet (four is better) at the top and bottom of the run, for a total of 16'10" or 18'10" for the entire run. Watch for head clearance on the stairs too. I don't remember the specific clearance off the top of my head, but your building inspector will be happy to tell you either before or after you build it. (get the before answer!)

Have fun with your new home!

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